The Effects of Amniotic Membrane for Prevention of Adhesion in Strabismus Surgery in Rabbits

ABSTRACT

PURPOSE: The formation of adhesion following strabismus surgery resulted in restrictive ocular motility dysfunction, recurrence, and failure of adjustable strabismus surgery. From these results, authors used amniotic membrane and evaluated its effect for prevention of adhesion in strabismus surgery in rabbit eyes. METHODS: Recession of superior rectus muscle was performed in 48 eyes of 32 rabbits. In 16 rabbits, both eyes were operated. Sixteen left eyes of 16 rabbits, control group, received no treatment after operation. In 16 right eyes of 16 rabbits, a sponge soaked in mitomycin C was applied after recession of superior rectus muscle. In 16 right eyes of other 16 rabbits, amniotic membrane transplantation was performed after procedure. After operation, 4 rabbits were sacrified in 24 hours, 2 weeks, 4 weeks, 3 months and evaluated the change of inflammation & fibrosis. The degree of inflammatory cell infiltration was evaluated on H & E stain and Masson-trichrome stain was performed to evaluate the degree of fibrosis. An immunohistochemical stain for alpha-smooth muscle actin was done for detection of myofibroblasts. RESULTS: On post-operation 24 hours and 2 weeks, the amniotic membrane-used group and the mitomycin C-used group showed less inflammatory cell infiltration than control group. On post-operation 2 weeks, 4weeks, and 3 months, amniotic membrane-used group and the mitomycin C-used group showed less fibrosis and fibroblast proliferation than control group (P<0.05). CONCLUSIONS: From these findings, authors conclude that the use of amniotic membrane transplantation after strabismus surgery is an effective method for prevention of postoperative adhesion.